# Relationship history for MSHA mine 0101565

Current hierarchy: **Imerys S A → Imerys Refractory Minerals USA Inc. → Barbour County Mines**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mullite Company Of America → Barbour County Mines; 1950-01-01 to 2020-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Asea Brown Boveri Ltd (ABB) → Barbour County Mines; 1950-01-01 to 2004-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Asea Brown Boveri Ltd (ABB) → Mullite Company Of America; 1950-01-01 to 2004-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Barbour County Mines; 2004-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Mullite Company Of America; 2004-01-05 to 2020-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Refractory Minerals USA Inc. → Barbour County Mines; 2020-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Barbour County Mines; 2020-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Refractory Minerals USA Inc.; 2020-07-01 to current/open; source msha-controller-operator-history